* Office of the National Counterintelligence Executive, [http://www.nacic.gov/history/CIReaderPlain/Vol3Chap1.pdf ''A Counterintelligence Reader'', vol. 3, chap. 1,] p. 31. | * Office of the National Counterintelligence Executive, [http://www.nacic.gov/history/CIReaderPlain/Vol3Chap1.pdf ''A Counterintelligence Reader'', vol. 3, chap. 1,] p. 31. |